When a musician and her husband retreat to an isolated Welsh countryside estate, their artistry—unwittingly—resonates with dormant ancient folk magic embedded in the land. The haunting melodies they create disturb a primordial force, summoning a mysterious, nameless child to their doorstep. This enigmatic figure, neither wholly innocent nor entirely human, arrives with a quiet yet relentless intent: to insinuate itself into the fabric of their lives, blurring the boundaries between inspiration and intrusion, creativity and curse.